一种可用于估计全球水汽标高的经验模型

doi:10.11947/j.AGCS.2015.20140664

测绘学报 ›› 2015, Vol. 44 ›› Issue (10): 1085-1091.doi: 10.11947/j.AGCS.2015.20140664

一种可用于估计全球水汽标高的经验模型

张豹¹, 姚宜斌^1,2,3, 许超钤¹

1. 武汉大学测绘学院, 湖北武汉 430079;
2. 武汉大学地球空间环境与大地测量教育部重点实验室, 湖北武汉 430079;
3. 地球空间信息技术协同创新中心, 湖北武汉 430079

收稿日期:2014-12-15 修回日期:2015-03-27 出版日期:2015-10-20 发布日期:2015-10-23
作者简介:张豹(1987—),男,博士生,研究方向为GNSS气象学与GNSS数据处理.E-mail:sggzb@whu.edu.cn
基金资助:
中央高校基本科研业务费专项资金(2014214020202);国家测绘地理信息局测绘基础研究基金(13-02-09)

Global Empirical Model for Estimating Water Vapor Scale Height

ZHANG Bao¹, YAO Yibin^1,2,3, XU Chaoqian¹

1. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China;
2. Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China;
3. Collaborative Innovation Center for Geospatial Technology, Wuhan 430079, China

Received:2014-12-15 Revised:2015-03-27 Online:2015-10-20 Published:2015-10-23
Supported by:
The Fundamental Research Funds for the Central Universities(No. 2014214020202),The Surveying and Mapping Basic Research Program of National Administration of Surveying, Mapping and Geoinformation (No. 13-02-09)

摘要/Abstract

摘要： 水汽标高是一个反映水汽垂直分布特征的参数,也是全球导航卫星系统(global navigation satellite system,GNSS)对流层天顶湿延迟改正和GNSS水汽层析中的一个辅助参数.本文对2006—2012年水汽标高的时间序列进行频谱分析,发现水汽标高在时间上呈现出年周期和半年周期变化,因此利用包含年周期和半年周期的三角函数来表达水汽的时变规律,然后利用欧洲中尺度天气预报中心(European Centre for Medium-range Weather Forecasting,ECMWF)的数据在全球1°×1°的格网点上分别拟合了三角函数的系数.通过上述方法首次构建了一个全球适用的水汽标高模型GSH,该模型既体现了水汽标高的时变特性又考虑了其地理差异.以无线电探空数据为参考,GSH具有-0.19 km的偏差(bias)和1.81 km的均方根误差(root mean square error,RMSE);以ECMWF数据为参考,GSH具有0.04 km的bias和1.52 km的RMSE.GSH整体上表现出了比较稳定的精度,可服务于GNSS气象学研究,也可为其他相关气象研究提供水汽标高参考.

关键词: 水汽标高, GSH模型, 水汽

Abstract: Water vapor scale height is an important parameter that reflects the vertical distribution of water vapor and also a key parameter that is usually used to make height correction in GNSS zenith wet delay and tropospheric tomography. Based on the spectral analysis of the time series of water vapor scale height from 2006 to 2012, it is found that the water vapor scale height shows an annual and a semi-annual variation in time. So, the trigonometric functions with an annual and a semi-annual cycle are used to express the time variation of water vapor scale height.And then the European Centre for Medium-range Weather Forecasting (ECMWF) data are used to fit the coefficients of the trigonometric functions at 1°×1° grid points on a global scale. By these methods,a global water vapor scale height model GSH is firstly established, which considers both the time and geographic variations of water vapor scale height. By taking radiosonde data as reference, the GSH model has bias of -0.19 km and rootmean square error (RMSE) of 1.81 km; by taking ECMWF data as reference, the GSH model has bias of 0.04 km and RMSE of 1.52 km. The GSH model shows a relatively even accuracy on a global scale, and could serve the study of GNSS meteorology and provide reference values of water vapor scale height for related meteorological researches.

Key words: water vapor scale height, GSH model, water vapor

中图分类号:

P228

张豹, 姚宜斌, 许超钤. 一种可用于估计全球水汽标高的经验模型[J]. 测绘学报, 2015, 44(10): 1085-1091.

ZHANG Bao, YAO Yibin, XU Chaoqian. Global Empirical Model for Estimating Water Vapor Scale Height[J]. Acta Geodaetica et Cartographica Sinica, 2015, 44(10): 1085-1091.

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一种可用于估计全球水汽标高的经验模型

Global Empirical Model for Estimating Water Vapor Scale Height

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